Extended 3. high volume listening can lead to permanent hearing loss. Do not wear headphones while 4. operating your detector near high- traffic areas. Be safe and pay attention to traffic. Functions and Indicators VOLUME - Sets the sound level. TUNE - Sets the sensitivity level of the unit. NOTE: Set to the lowest setting when away from any metal objects. MODE - Sets the unit to two modes: OPERATE and BATT TEST. Red Tuning Button - Press this button and set the TUNE dial to 0 to properly balanc